You might be able to find a little rubber cap for them - I'd pop something like this on them https://www.vital-parts.co.uk/silicone-caps---sic049-942-p.asp
Yes indeed. I'm slightly surprised that Ducati didn't make something like that as standard, but it does the job as it is, I suppose.
A bit of a hijack, but it's reminded me to get a longer bolt for my stop as I've lost steering angle after changing bars. Thanks!